TCP Server

[Congon4tor 0]

Had some trouble getting a TCP connection between an OpenComputers program (client) and a java program (server), so I thought I could sare this.

 

Here is the lua program:

--VARIABLES
local event = require("event")
local net = require("internet")
local term = require("term")
local os = require("os")
 
local running = true
 
local con = net.open("192.168.1.100", 6667)
 
--FUNCTIONS
function sendString(s)
    con:write(s)
    print('Sending ' .. string.sub(s,1,s:len()-1) .. ' to server...')
    con:flush()
end
 
function reciveString()
    local s = con:read()
    print('Recived ' .. s .. ' from server...')
    con:flush()
end
 
--MAIN
 
if con then
    print('Connected to the server!')
end
 
while running do
    local s = term.read()
    sendString(s)
    reciveString()
    os.sleep(0)
end

And here the java code:

import java.io.*;
import java.net.*;

class TCPServer {
	public static void main(String argv[]) throws Exception

	{
		String clientSentence;
		String capitalizedSentence;
		ServerSocket welcomeSocket = new ServerSocket(6667);
		Socket connectionSocket = welcomeSocket.accept();

		while (true) {
			if (!connectionSocket.isConnected()) {
				connectionSocket = welcomeSocket.accept();
			} else {
				System.out.println("Connected to client");
				BufferedReader inFromClient = new BufferedReader(
						new InputStreamReader(connectionSocket.getInputStream()));
				clientSentence = inFromClient.readLine();
				System.out.println("Received: " + clientSentence);
				capitalizedSentence = clientSentence.toUpperCase() + "\n";
				DataOutputStream outToClient = new DataOutputStream(connectionSocket.getOutputStream());
				System.out.println("Sending: " + capitalizedSentence);
				outToClient.writeBytes(capitalizedSentence);
			}

		}
	}
}

Also make sure you have TCPEnabled on the config file and if your tcp server is in the same machine as the minecraft serve remove form the ip blacklist your networks ip.

 

Hope this helps someone